It was the first Exo single not to feature member Lay due to his extended hiatus.

Baekhyun stated "I wanted my lyrics to have people to become more carefree, release their stress and dance away with the music.

[7] It was reported that multiple servers crashed, due to the number of fans streaming at the same time.

It also became the highest for an idol group (Male or Female) in 2017 with 78,121 unique listeners during the first hour of release.

[16][17] For the month of August, "Ko Ko Bop" topped the Gaon Monthly Digital and BGM Charts,[18][19] making Exo the first group in 2017 and the fifth boy group since 2012 to top the chart.

Exo's fans began a viral Internet video trend called Ko Ko Bop Challenge where people dance the quick hip thrust succession choreography of the song to the lyrics "Down down baby".

[20] The hashtag #KoKoBopChallenge was used for popular social media platforms such as Twitter, Instagram and Weibo.

[23] The music video was filmed in Seoul, South Korea.The music video shows the boys spending a day having fun as the name of the suggests "Ko Ko Bop" meaning fun dancing.

[25][better source needed] On July 8, Exo's official Twitter account had been activated to public, through which SM Entertainment revealed the first teaser video for the album.